Add specs for Virtus#attributes=
Add specs for Virtus#attributes=

reevoo/virtus,artemeff/virtus,mallikarjunayaddala/virtus,baojjeu/virtus,hapiben/virtus,XescuGC/virtus,macressler/virtus,JustMikey/virtus,solnic/virtus,faucct/virtus,dslh/virtus